Process and product of treating wood.



J withthe light, spongy wood -ess'r AVAILABLE coex HARRY W. :B1t0ADY, oi Bnsmnmw; song,

Afsszenonmo Tim nonnm consent,

me, on LONG xsnAnn p ng new orange conrone'rzon on new Yonx.

' i No Drawing. t

To all whom it mag concern: I

I Be it known that I, HARRnWQBnoAnY a i citizen of the UnitedwStates, and 5, resident of Bayside, county of Nassau, and State of 5 New;York, have invented certain neW:.and useful Improvements inProcesses and Prod-- nets of Treating Wood,=0f which the following is a description insuch full, clear, and exact terms as will enable any-person skilled in the art to which it pertains to make and use the same.

My invention Wood by its impregnation or,

whichiis at once waterproof and "antiseptic;

and its object is to securea, mixture of Waterproof and preservative materials and a mode of working with difiiculties of penetrating tothe innermost recesses of the wood-andform a, perfect,

and antiseptic coat or'covermg Waterproof on the interiorwalls ofthe cells or cavities of the wood. The mixture may also, it die 1 sited, be made to seal orplu'g-up the fopnor exposed outer, endsof the. wood cavities 017,1 pores.- Such treatment not only tends to prevent moisture from enteringthecavities but it coatsthe walls thereof so that should; moisture enter it willnot be absorbedby the Wood fiberiitself EIIldthGi'WOOd caused to take what is commonly known as a watert I I I U I tore than that of eitherconstituentj, and the logged condition.

The difliculty compound fills the woodirregularly and cannot be forced into,,the innermostjcavities 40 of the .wood, particularlyrwhenrothe wood is treated in large pieces it has left the outer parts of the cavities clogged with too much best results for these soperationsz verious mixtures of hydrocarbons; ghave been' employed with varying ,but-notcomplete sue-t, H

raised to approximately 21-2? 110.265? F cess. This is particularly true in connection sphalt' nelates-to of more exactly coating the interior wallsfof its pores or hot liquid or fiuidjbut; ofcourse, them which will '20 cause the mixturereadily and completely to 1 enter the cavities, overcome the mechanical I has been with thel orocess heretofore employed that thei -waterproof known as hat I rnocnss nnnnnonuc'r on-Tnnnmne ween.

I Specification. of Letters Patent: Patnjtd Nov, 7,1916, Application filed October 27, is e." Sri'e1ito.,5e,2 32, f I r j v i sede palmo, Oohromw ilqoapue') which species of wood t is an especial oinectoi my these diifik.

- mventionlsuccessfully tot 'eat.

- My invention seeks to solve ably in the proportions of bitumen-25% and paraffin 75%. v asphelt; My experimentshaveindicatedthat defined .as solid or. :sexniesolid bitumen and described in theQYear-Book of the 1915', published by the society isbest suited to my vpurpose specificallylimited, This asphalt atinormal atmospheric temperatures l takes a haiidened flier 6.,v a degree of hardjness 'or. firmness,

I not necessarily as 'hard'as woodiforeimm 1e; and it islin' this sense that the ter' m tli r'den is used. 7 The perafiin m'ay b th paraffin of commerce. "Parafii though other materialsmay' b i s P a e,- ex p i Land bitumen serve the ,functio proof. coat and both-Ycontribu is nt:prep slto er Y.

the bitumen has an antiseptic eiiiectj on the wood w hichis of great value iii-my pi'ccess.

I These. ingredients are mixed by 'melting them; togethen' at e tempei atureot {approximately 130) E n; which they; take, liquid 01 viscous form" end niin thoroughly. a The two mateiiels thus mixedginelt iii; 21 lower tempera.-

resultant mixture is astableloiie inlwhich thetwoImziterials do not {tend to "fs'ettle out The materials or ingredients the same way that,,metals The parafiin.behavessome v or separate.

nnlte 1n\ much un te 1n alloys.

.what as a solventyof-jthe bitumenyit has the lower melting point hnd appears to bring down themelting point ofit-the ;bitumen.

When the hot .in cured orpertly curedformwis submerged in the mixture of the bitumen andvparafiin end thetemperature of such mixture is The result is that the moisture in'thqwood OFFICE, A

American Society for Testing Matem'als for" but my" invention" is not .so

bath is} thus pi epared the Wood in its, normal green ;state, or desired- The bitumen is preferably Q BESTAVAILABLE GOP,

is driven oi as steam and escapes inbubbles through the bath of paraflin and bitumen during and after which the mixture enters the pores and cavities of the wood. This mixture'of parafiin and bitumen is extremeliy fluid at'the temperature described and res ily penetrates the. wood deeply, the wood appearing to have a peculiar attraction for the mixture which greatly facilitates the' treatment.

It is also an object of my invention to cause the mixture to spread out in a film or coat along the inner surfaces of the walls of. the good cavities and not simpl to plug or clog up the ends or even comp etely to fill" these cavities. These'undesirable latter conditions are frequently the effect of the processes heretofore employed, i; e., when the wood is treated by submersion in a hot bath of ordinary waterproof compounds, part of the cell walls are coated, but in other places I the mixture lies 'in agglomerated masses long the first heatin tendng to fill and clog the cavities and to still other places the mixture does not reach at all and the walls at these points are left untreated and hence unprotected from moisture. This is due sometimes to the size of the wood treated and the consequent remoteness of the cavities, but more generally to the expansion of the gases trapped in the wood cells, which gases occupy the inner recesses and prevent the mixture from entering. I overcome this defect by treating the wood to a primary submersion which is preferably carried on until the bubbling ceases, this bubbling being due to the escape of moisture (steam) and gases from the wood. The time required for the primary submersion depends upon, the size and kind of wood treated. It drives off part of the moisture and part of the expanded gases from the wood and effects penetration as completely as may be at that time. Then the bath is allowed to cool andharden with the wood therein after which it is again heated and liquefied as before. The second heatin should be continued until the wood is heated throughout; there is practically no bubbling on the second heating. By tests it has been determined that this reheating required from one to six hours, according to the size and kind of wood. The mixture thereupon completes its entry into the wood and extends farther than it can be made to extend by one continuous he ting, no matter how is maintained. In this way I secure one of the rincipal objects of my invention, 0., the tliorough penetration of the wood. If desired the wood may be withdrawn from the mixtu're after the first heating and die second heating of the wood carried out in any suitable heatthat this doc penetration of the wood upon heating, coo ing and reheating of the mix ture is due largely to the action of the gases in the;] pores expalndin and conltlracting under t e varyin eat egress, t e gases expandin under the' first heatin and that partw ich is not actually ven or driven of! at the fird' heating contracting on the coolingso that a partial vacuum is formed in the innermost parts of the wood cavities which allows the pressure of the atmos phere to force the still soft mixture farther into the wood until the mixture cools. Then on reheating the mixture enters farther into the wood and, being liquefied throughout, is allowed to flow even y andthoroughly over all of the oer out-faces of the cells, coating or linin them, b :wi'thout clogging or agglomeratirg in the This isthought Having thus described myinvention, what I claim as new and d sire to secure by Letters Patent of the United States is 1; The process of preserving wood which consists in coating or lining the walls of its recesses or cavities with a fluid mixture of paraflin and bitumen and causing said mix 'ture to harden in the wood.

2. The process of preserving wood which consists in coat ng or lining the walls of its recesses or cavities with a fluid mixture of paraflin and asphalt and causing said mixture to harden in the wood.

3. The process of preserving wood which consists in coating or lining the walls of its recesses or cavities with a fluid mixture containinsz bitumen and causing said mixture.

to harden in the wood.

. 4. The process of preserving wood which consists in coating or lining the walis of its or cavities with a fluid mixture con- Ill taining asphalt and causing said mixture to harden in the wood.

. 5. As a new article of manufacture, wood the wallsof the or cavitiesof which are coated or lined with a hardened mixture of paraflinand bitumen. l

6. As a new article of manufacture, wood the walls of the recesses or cavities of which are coated or lined with a hardened mixture containing bitumen.

'7. As a new article of manufacture, wood the walls of, the racemes or cavities of which are coated or lined with a hardened mixture signed my name in the presence of two witcontaligfing asphalt. f d nesses. 8. .s a new article of manu acture WOO the Walls of the recesses or cavities of which HARRY 5 are Coated'or lined with a hardened mixture Witnesses:

of asphalt and paraffin. ISAAC B. OWENS, In testimony whereof I have hereunto PATRICK A. BOLGER. 

